Guhring - 1-8 UNC 4 Flute 2B Bottoming Spiral Flute Tap - Cobalt, TiN Finish, 5.13" OAL, Right Hand Flute, Right Hand Thread, Series 3977

Bottoming chamfers are used for threading blind holes. They have 1 to 2 threads.

Cobalt is harder than high speed steel and provides better wear resistance. It is commonly used on high tensile alloys.

Titanium Nitride (TiN) is a multi-purpose coating which increases chip flow in softer materials. The heat and hardness resistance allows the tool to run at higher speeds than uncoated tools.

Fast Spiral Flutes with 40-53 degree angles are suitable for ductile materials like aluminum and copper; medium to high carbon steels and free machining stainless steels.